How Wide Does an Accessible Parking Space Have to Be in California?
Short answer: 9 feet for a car space, 12 feet for a van space, and 18 feet long. If you built to the federal ADA numbers, your lot is too narrow for California.
This is the single most common thing I find wrong on a California parking lot, and it is almost never carelessness. It is a contractor who looked up the ADA, found the right federal number, and striped the lot correctly — for Ohio.
Two laws apply at the same time
The Americans with Disabilities Act is federal civil rights law. It applies everywhere in the country and it sets a floor.
California's Building Code, Chapter 11B, is state law, enforced by your local building department. On parking, it is stricter than the ADA in most respects.
Both apply to your lot at once. Where they differ, you have to meet the more restrictive one. Meeting the federal minimum does not get you there in California, and a lot that passes a federal check can still draw a demand letter here.
The dimensions that govern in California
Car space: 108 inches wide. That is 9 feet. The federal ADA requires only 96 inches, which is 8 feet. California is a full foot wider.
Van space: 144 inches wide. That is 12 feet. The ADA requires 132 inches, or 11 feet.
There is an exception worth knowing. A van space may be 108 inches — 9 feet — if the access aisle beside it is at least 96 inches, or 8 feet, wide. So you can trade stall width for aisle width, but you cannot simply build the narrower stall.
Length: 216 inches. That is 18 feet, and it applies to both car and van spaces. This one catches people, because the federal ADA does not specify a stall length at all. If you were working from the ADA, there was no length requirement to miss — California added one.
Access aisle: 60 inches minimum. Five feet, and this is one place the two codes agree exactly. The aisle also has to run the full length of the stall it serves.
Where people measure it wrong
Measure centerline of stripe to centerline of stripe. A four-inch stripe measured from the wrong edge costs you four inches of stall, and four inches is often the difference between a compliant space and a finding.
There is one exception. Where a space or access aisle is not adjacent to another space or aisle — an end stall against a curb, for example — you may include the full width of the line defining it.
The other common error is the 18-foot length. Measure it from the head of the stall. A wheel stop, a bumper, or a curb does not shorten the stall. The full 216 inches has to be there whether or not something is sitting in the way.
Left: measuring stall width across the space. Right: measure to the centerline of the stripe — not the inside or outside edge.
Why a foot matters
It sounds like a technicality. It is not.
The nine-foot stall plus the five-foot access aisle exists so that a person using a wheelchair can open a door fully, deploy a ramp or lift, and transfer without being in a traffic lane. Take away a foot and the maneuver either does not work or happens in the drive aisle.
That is also why the number is not negotiable in an enforcement action. It is not a paperwork requirement. It is the geometry of getting out of a vehicle.
What to do about it
Go measure. A tape measure and twenty minutes will tell you whether the stalls you have match the numbers above.
If they do not, restriping is usually far cheaper than the alternative — provided the total lot geometry still allows a compliant space. Sometimes it does not, and that is a harder conversation, but you want to have it on your own schedule rather than after a claim is filed.
And be aware that stall width is only one of about eight things that has to be right. The dimensions can be perfect while the slope, the signage, or the striping fails.
Code references
Parking space dimensions — 2025 CBC 11B-502.2 / 2010 ADA 502.2
Access aisle — 11B-502.3.1 / ADA 502.3.1
Measurement of spaces and aisles — 11B-502.1
Confirm against the currently adopted code for your jurisdiction. Local amendments can apply.
Stephen Twist is a Certified Access Specialist (CASp #393) and an ICC Certified Plans Examiner. He provides CASp inspections in California and building code and accessibility plan review nationwide.
Want to check your whole lot, not just the stall width? The DIY Accessible Parking Inspection course walks through every element — count, dimensions, striping, slope, signage, clearance and EV stalls — with printable field forms. $199, one time.
Design professionals: if you would rather have the plan reviewed before it is built, get in touch.